Question

Question #94672

Answer 1

The new pressure `"P"_2=420\ "kPa"`

Explanation:

The general equation of ideal gases follows the following form:
`("P"_1*"V"_1)/("R"*"T"_1)=("P"_2*"V"_2)/("R"*"T"_2)` .......... (1)
At constant temperature, `"T"_1` = `"T"_2`. Thus, the equation Form (1) is reduced to: `"P"_1*"V"_1="P"_2*"V"_2`, which will lead to the following form:
`"P"_2=("P"_1*"V"_1)/"V"_2` ................. (2)
`"P"_2=(42\ "kPa"*20\ "L")/(2\ "L")`
So, `"P"_2=420\ "kPa"`
With kind regards: Mamdouh Younes